INVESTIGATION OF THE PROCESS OF SULFIDING OF GOLD-ARSENIC CONTAINING ORES AND CONCENTRATES

Дослідження процесу сульфідування золото-миш’яковмісних руд і концентратів
Mambetaliyeva A.R. Mamyrbayeva K.K. Turysbekov D.K. Dauletbakov T.S. Barmenshinova M.B.
2022 Natsionalnyi Hirnychyi Universytet

Naukovyi Visnyk Natsionalnoho Hirnychoho Universytetu
2022 Issue 3 51 - 56 pp.

Purpose. Research of the removal of arsenic by sulfiding from gold-arsenic containing concentrates of the Bakyrchik deposit. Methodology. To determine the composition of the samples, chemical and electron probe analysis were carried out; to determine the phase composition of materials, X-ray analysis was conducted. In order to predict the process of sulfidation of arsenic and its compounds in the range of 298–2000 K, a thermodynamic analysis was performed. To establish the optimal conditions for the process of sulfiding arsenic and its compounds, studies were carried out to determine the effect of temperature and the consumption of elemental sulfur on the degree of sublimation of arsenic from gold-arsenic concentrate. The sulfiding roasting of the concentrate was carried out with elemental sulfur vapor coming from a new design evaporator with a mixture of gaseous nitrogen. Findings. The main minerals of the original concentrate are pyrite, marcasite, arsenopyrite, native gold and silver. Significant elements in the concentrate are, %: arsenic 2.9–3.1, iron – 70–7.3, gold – 40. It has been calculated by thermodynamic analysis that when the main minerals of gold-arsenic containing refractory ores and concentrates interact with sulfur in a neutral environment and in the range of 500–1000 °C, reactions of formation and removal of arsenic in the form of sulfides As₂S₃ and As₄S₄ occur. When a new design evaporator supplies elemental sulfur in a mixture with neutral gas and with an increase in firing temperature from 700 to 850 °C at S: As = 0.35: 1, the degree of sublimation of arsenic increases from 94.7 to 98.2 %, with FeS₂ : As = 1.3: 1 – from 94.0 to 99.5 %. With an increase in the consumption of elemental sulfur vapor (with an increase in the S: As ratio from 0.35: 1 to 0.6: 1 and a temperature from 700 to 800 °C), the degree of sublimation of arsenic from the gold-arsenic product reaches up to 99 %. The condensed sublimes contained up to 98.5–99 % As₄S₄ and As₂S₃, the dust caught in cyclones is close in its composition to the composition of cinder. Originality. A new technology for the removal of arsenic from gold-arsenic containing concentrates in an oxygen-free atmosphere in the temperature range of 700–850 °C with the removal and capture of arsenic sulfides up to 100 % is proposed. The regularity of the degree of sulfidation of arsenic and its oxidized compounds by elemental sulfur vapors in a mixture with a neutral gas to As₄S₄ and As₂S₃ has been established. Practical value. The use of the new technology makes it possible to completely convert arsenic into sulfide forms which are environmentally friendly, convenient for storage, burial, or for use as antiseptics. The development can be used for processing arsenic-containing polymetallic ore materials.

arsenic , arsenic sulfides , evaporator , gold-arsenic containing sulfur concentrate , sublimation , sulfidation , sulfide roasting

Text of the article Перейти на текст статьи

Satbayev University, Almaty, Kazakhstan
JSC Institute of Metallurgy and Enrichment, Almaty, Kazakhstan
Innovative Eurasian University, Pavlodar, Kazakhstan

Satbayev University
JSC Institute of Metallurgy and Enrichment
Innovative Eurasian University

10 лет помогаем публиковать статьи Международный издатель

Книга Публикация научной статьи Волощук 2026 Book Publication of a scientific article 2026